DESCRIPTION
The Heated Oxygen Sensors (HO2S) are located in the dual converter Y pipe below the exhaust manifolds and below the catalytic converters.

OPERATION
The heated oxygen sensors react with the oxygen in the exhaust gases and generate a voltage based on this reaction.

*A low voltage indicates too much oxygen or a lean condition.
*A high voltage indicates not enough oxygen or a rich condition.

The Left Heated Oxygen Sensor (HO2S) # 1 is located in the lower LH rear of the engine, in the exhaust manifold.